BIO_Ch01_LQ_e.doc - HKDSE BIOLOGY: Connecting Concepts...

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HKDSE BIOLOGY: Connecting ConceptsChapter 1Question bankStructured questionsStructured questions|!|BCELA0010000001|!|SINOSIn the past, scurvy was a common disease among sailors and its cause was unknown. Adoctor called James Lind designed an experiment to investigate the cause of scurvy.During one of his sailing trips, he divided 12 sailors suffering from scurvy into six pairsand gave additional food on their basic diet. He then observed whether the pairsrecovered from scurvy. He maintained the same environmental conditions and dietamong all pairs. The type of additional food and the results are tabulated as below:PairAdditional foodResults1ciderSymptoms did not disappear.2sulphuric acidSymptoms did not disappear.3seawaterSymptoms did not disappear.4garlic, mustardSymptoms did not disappear.5vinegarSymptoms did not disappear.6oranges and lemonsSymptoms disappeared.(a)How did James Lind manipulate the control variables?(2 marks)(b)Lind drew a conclusion that a lack of citric fruits, such as oranges and lemons inthe diet could cause scurvy. Suggest why the design of his experiment was notadequate to demonstrate a lack of citric fruits in diet could cause scurvy.(3 marks)(c)Scientific knowledge relies heavily on rational arguments and skepticism. Afterreading the story of James Lind, a scientist was skeptical about his conclusion andwrote down the following argument:‘Citric fruits should be the cure of scurvy. It is not reasonable toconclude that a lack of citric fruits is a cause of scurvy.’Justify the scientist’s claim.(3 marks)© 2019Aristo Educational Press Ltd.1
HKDSE BIOLOGY: Connecting ConceptsChapter 1Question bankStructured questions##(a)He allocated same number of sailors in each pair.(1)He maintained the same environmental conditions and diet among all pairs.(1)(b)The sample size of each group is not large enough. (1) /Feeding sulphuric acid or seawater to sailors would cause health problems, whichmay deteriorate scurvy. (1) /There is no controlled experiment, i.e. pairs of sailors having normal diet. (1) /Sailors were not randomly allocated into each group receiving different additionalfood. (1)(Max. 3)(c)The scientist’s claim is correct.(1)Symptoms in sailors disappeared after having citric fruits, showing that citric fruitscould be a cure of scurvy.(1)There was no evidence on the deficiency of citric fruits of sailors shown.(1)________(8 marks)##Skills assessedMarks(a)Applying concepts2(b)Applying concepts3(c)Critical thinking3|!|BCELA0010000002|!|SI

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Term
Fall
Professor
N/A
Tags
Bacteria, Helicobacter pylori, Aristo Educational Press Ltd

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